add a ruby method

including source ast and args, later locals

lib/melon/compiler/ruby_method.rb

@@ -0,0 +1,12 @@
+module Melon
+
+  class RubyMethod
+
+    attr_reader :name , :args_type , :body
+    
+    def initialize(name , args_type , body )
+      @name , @args_type , @body = name , args_type , body
+    end
+
+  end
+end